student_list = {
    "Alice": {"age": 18, "score": 85.5}, 
    "Bob": {"age": 19, "score": 90.0}
}
#添加一个新学生“Charlie”，年龄为20岁，成绩为78.5
student_list["Charlie"] = {'age' : 20 , 'score' : 78.5}
#修改Alice的成绩为88.0
student_list['Alice'] = {"age": 18, "score": 88.0}
#删除Bob的信息
value = student_list.pop('Bob')
#遍历字典，打印每个学生的姓名、年龄和成绩
stu_sge = {
    "Alice" : 18,
    "Charlie" : 20
}
stu_score = {
    "Alice" : 88.0,
    "Charlie" : 78.5
}

for key in student_list:
    print(f"学生:{key},年龄:{stu_sge[key]},成绩:{stu_score[key]}")

print(student_list)